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Home / Products / Astronomy Focuser / K008 1.25 Inch Double Helical Focuser fo
K008 1.25 Inch Double Helical Focuser for Guider Finder Fcope

K008 1.25 Inch Double Helical Focuser for Guider Finder Fcope

The K008 1.25 Inch Double Helical Focuser is a precision focusing mechanism for guider and finder scopes in astronomical telescopes. Constructed from full metal, it delivers smooth, accurate focusing with a 0.05mm precision and a 10mm focusing stroke. The unit features a 1.25 inch interface with M42×0.75 male thread and compatible M31×0.5 primary mirror interface, designed to resolve sluggish focusing in telescope systems.

  • High precision double helical mechanism with 0.05mm accuracy for stable focusing
  • Full metal construction ensures durability under repeated use
  • 10mm focusing stroke allows fine adjustment for critical alignment
  • 1.25 inch interface with M42×0.75 male thread for compatibility with standard finder scopes
  • M31×0.5 male thread interface for direct mounting on primary mirrors
  • Compact design with minimum length 43mm and maximum length 53mm
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Technical features

  • Double helical focuser design for high precision and smooth motion
  • Focusing stroke: 10mm
  • Minimum length: 43mm
  • Maximum length: 53mm
  • Net weight: 100g
  • Interface: 1.25 inch with M42×0.75 male thread
  • Primary mirror interface: M31×0.5 male thread
  • 1.25 inch adapter with M28×0.75 female thread for telescope compatibility

Who it is for

  • Astronomy equipment integrators building or upgrading telescope systems
  • Amateur and professional astronomers sourcing replacement focusers
  • Distributors supplying accessories for telescope assembly and repair

Specifications

ModelK008
Focuser TypeDouble Helical
Interface Size1.25 inch
Primary Mirror InterfaceM31×0.5 male thread
Adapter ThreadM28×0.75 female
Focusing Stroke10mm
Minimum Length43mm
Maximum Length53mm
Net Weight100g
Precision0.05mm
ColorBlack

Use guide

  • Verify that the primary mirror has M31×0.5 male thread before mounting
  • Attach the focuser to the mirror using the M31×0.5 interface
  • Connect the 1.25 inch adapter to the focuser’s M42×0.75 male thread
  • Insert the guider or finder scope into the 1.25 inch barrel
  • Adjust focus using the double helical mechanism for fine alignment

FAQ

What is the focusing precision of the K008 focuser?
0.05mm accuracy per full rotation of the focusing knob.
Can this focuser be used with a 2 inch finder scope?
No. It is designed for 1.25 inch accessories only. A 2 inch adapter is not included.
What is the length range when the focuser is extended?
Minimum 43mm, maximum 53mm with full 10mm focusing stroke.
Is the interface compatible with M31×0.5 mirror mounts?
Yes. The primary mirror interface is M31×0.5 male thread for direct mounting.
What is the weight of the focuser?
Net weight is 100g, including the full metal body and adapter.

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